# Radius of circle given area Calculator

## Calculates the radius, diameter and circumference of a circle given the area. | ||

- Purpose of use
- Wanted to find radius in metres of a circle which is 1 hectare in area. But this calculator doesn't understand units of area like hectare or acre.

- Purpose of use
- pool calc

- Purpose of use
- Have recipe for 3 X 21 cm meringue circles, want to make 4 smaller ones using same quantity of mixture so needed to know diameter of smaller circles!

- Purpose of use
- Too lazy to do the calculation myself, simulating a perceived area of another geometric shape into what the given circular radii would be.

- Purpose of use
- Subwoofer cone area (Effective piston Area) was given in subwoofer specifications, but not cone diameter. Needed exact cone diameter.

- Purpose of use
- Video game development software.

Modulating virtual foliage density. Given a constant number of desired instances per surface area, I increase the surface area based on a foliage desire factor [0-1], where 1.0 keeps the current surface area, and 0.5 doubles it. If the desired number does not exceed the number of existing pieces of foliage in the area around the proposed foliage we do not place it.

- Purpose of use
- For normal measurement
- Bug report
- radius into diameter

- Purpose of use
- Calculate varying radius of circular vents I need to CAD out with a given fixed area total.

- Purpose of use
- Geocaching

- Purpose of use
- Exploring
- Bug report
- Great web site. However, your legend says:

(2) area: R=2r

this should be 'diameter:' - from Keisan
- Thank you for pointing it out.

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